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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

In this simulation, learners explore how ocean currents spread all kinds of pollution—including oil spills, sewage, pesticides and factory waste—far beyond where the pollution originates.

In this activity, learners will model the mechanical weathering and erosion of rocks in a stream or river.

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

In this simulation activity, learners observe what can happen when ocean waves churn up water and oil from an oil spill.